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Reconstructing the build-up of a pelagic stickleback (Gasterosteus aculeatus) population using hydroacoustics

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2019

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Engesser, Brigitte

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https://doi.org/10.1016/j.fishres.2018.08.002
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Fisheries Research. 2019, 210, pp. 189-192. ISSN 0165-7836. eISSN 1872-6763. Available under: doi: 10.1016/j.fishres.2018.08.002

Zusammenfassung

A lake wide fishing survey of Upper Lake Constance revealed that in September 2014 three-spined sticklebacks (Gasterosteus aculeatus) made up 96% of the pelagic fish community in terms of number. To narrow down the point in time when sticklebacks started to colonize the pelagic zone and to reconstruct the build-up of this unprecedented population size, we analysed 18 hydroacoustic surveys from March 2009 to March 2018. As current analysis techniques do not allow discriminating echoes from different fish species of similar size, we considered as sticklebacks all fish smaller than a certain single-target threshold minus the average abundance of small fish well before the sticklebacks invaded the pelagic zone. Our data suggest that sticklebacks colonized the pelagic zone in 2012, one year before they appeared as by-catch in test fisheries. Population density fluctuated between 1280 and 7990 individuals/ha from November 2012 to March 2018 but never fell below 2900 individuals/ha in recent years. These estimates do not include shallow waters where densities might be even higher because the nearshore zone was excluded from our surveys.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Abundance estimation, Echo integration, Pelagic fish community, Single echo detection

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ISO 690ECKMANN, Reiner, Brigitte ENGESSER, 2019. Reconstructing the build-up of a pelagic stickleback (Gasterosteus aculeatus) population using hydroacoustics. In: Fisheries Research. 2019, 210, pp. 189-192. ISSN 0165-7836. eISSN 1872-6763. Available under: doi: 10.1016/j.fishres.2018.08.002
BibTex
@article{Eckmann2019-02Recon-43473,
  year={2019},
  doi={10.1016/j.fishres.2018.08.002},
  title={Reconstructing the build-up of a pelagic stickleback (Gasterosteus aculeatus) population using hydroacoustics},
  volume={210},
  issn={0165-7836},
  journal={Fisheries Research},
  pages={189--192},
  author={Eckmann, Reiner and Engesser, Brigitte}
}
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    <dcterms:abstract xml:lang="eng">A lake wide fishing survey of Upper Lake Constance revealed that in September 2014 three-spined sticklebacks (Gasterosteus aculeatus) made up 96% of the pelagic fish community in terms of number. To narrow down the point in time when sticklebacks started to colonize the pelagic zone and to reconstruct the build-up of this unprecedented population size, we analysed 18 hydroacoustic surveys from March 2009 to March 2018. As current analysis techniques do not allow discriminating echoes from different fish species of similar size, we considered as sticklebacks all fish smaller than a certain single-target threshold minus the average abundance of small fish well before the sticklebacks invaded the pelagic zone. Our data suggest that sticklebacks colonized the pelagic zone in 2012, one year before they appeared as by-catch in test fisheries. Population density fluctuated between 1280 and 7990 individuals/ha from November 2012 to March 2018 but never fell below 2900 individuals/ha in recent years. These estimates do not include shallow waters where densities might be even higher because the nearshore zone was excluded from our surveys.</dcterms:abstract>
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